An adjuvant shouts at your immune system to pay attention to the vaccine, basically. Boosters are needed because that shout fades, and some viruses change their coats. The lifetime ones, like for measles, probably caught your body at the perfect, stubborn age. I got my two doses, skipped the booster thinking "pokpa" already, and spent a wretched fortnight coughing my lungs out—so clearly, my faded shout wasn't enough for the latest variant loitering around Paona Bazaar.
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